My daughter (14) has become exceptionally disrespectful over the last couple of years probably since around half way through y7. Her dad and I separated Christmas 2017 when he walked out unannounced once he'd began a relationship with an 18yo girl. At the time, my daughter resented him because it was obvious his gf was his priority. He lies and is very manipulative. He has only prioritised our daughter since his gf left him. Fast forward to now, he has filled my daughter's head with rubbish so much that she disrespects me constantly. If I ask her to pick up after herself or do her homework, she tells me I'm controlling her. She's even told me I shouldn't get involved with her schoolwork because it's none of my business. I've told her that whilst she's a child and her teachers email me to say she's not done as asked and could I encourage her to do better, I will still remind her. I have spoken to her dad about it but he will say anything to please her regardless of how daft it is. He bad-mouths her school in front of and to her and says I shouldn't keep telling her to do as she's asked. (Her school is actually really good and supportive.) He's also said that in his house, he picks up after her to save arguments so I should too and that I'm too argumentative for constantly asking her to do stuff. I don't confront or shout. It's a simple ask. I've learnt to close her bedroom door so I can't see that mess but when it extends to communal areas of my house, she should respect it. When she was with him during one call, he told me I was backward and a moron for not allowing her to just go to him because she had been told off for leaving my house in a complete mess. If she's ever told off or doesn't agree with me reminding her that she has homework, she calls her dad and complains. He always tells her what to say to me. There are comments he's said in the past and she repeats it now- things that she wouldn't naturally say. When she's at his, she always has the phone on loudspeaker so he can listen. He says it's not but occasionally I'll ask her a question and he'll answer forgetting he's not supposed to be listening in. He always reassures her that I'm being ridiculous. I even overheard them having a conversation both absolutely slagging me off. My dad died and I sold his house and he passed comment on that too during this conversation. I confronted them about it and he told her off for not telling him I had a security camera fitted. It was just a coincidence that I'd checked my camera at the time because my daughter should have been at his house. I'm not an unfair parent. My daughter is well looked after and gets plenty of attention. I'm at the end of my tether and I don't know what to do. Is this parental alienation?